Các control bản chất nằm trong 1 container cha. Các container đều chứa các control trong thuộc tính Controls của nó. Bạn có thể duyệt các control con thông qua cách dùng foreach

foreach(var item in panel.Controls)
{
   // lấy item ra ép kiểu về đúng control của nó mà sài
}

public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            FuncetionDisAll(textBox1, button1, label3);
        }

        private void FuncetionDisAll(TextBox a,Button b,Label c)
        {
            b.Enabled = false;
            a.Enabled = false;
            c.Enabled = false;
        }
    }
//cái control nào hk cần dis thì thôi! bạn có thể switch để tối ưu nhiều Function cho nhiều role khác nhau

hoặc

private void DisableControls(Control con)
        {
            foreach (Control ctrl in con.Controls)
            {
                
                if (ctrl.Tag=="TagDisable")
                {
                    ctrl.Enabled = false;
                }
            }
        }


use:

instanceControl1 = new UserControl1();
DisableControls(instanceControl1);

Tôi đã thử với code sau, nhưng vẫn không được, mong Kteam giúp với, tks

Form

partial class Test
    {
        /// <summary>
        /// Required designer variable.
        /// </summary>
        private System.ComponentModel.IContainer components = null;

        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
        protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null))
            {
                components.Dispose();
            }
            base.Dispose(disposing);
        }

        #region Windows Form Designer generated code

        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
            this.panel1 = new System.Windows.Forms.Panel();
            this.panel2 = new System.Windows.Forms.Panel();
            this.panel3 = new System.Windows.Forms.Panel();
            this.groupBox1 = new System.Windows.Forms.GroupBox();
            this.dgvAccount = new System.Windows.Forms.DataGridView();
            this.label1 = new System.Windows.Forms.Label();
            this.label2 = new System.Windows.Forms.Label();
            this.label3 = new System.Windows.Forms.Label();
            this.txbUserName = new System.Windows.Forms.TextBox();
            this.txbDisplayName = new System.Windows.Forms.TextBox();
            this.txbPassword = new System.Windows.Forms.TextBox();
            this.btnAdd = new System.Windows.Forms.Button();
            this.btnEdit = new System.Windows.Forms.Button();
            this.btnSkip = new System.Windows.Forms.Button();
            this.btnSave = new System.Windows.Forms.Button();
            this.btnDelete = new System.Windows.Forms.Button();
            this.btnClose = new System.Windows.Forms.Button();
            this.panel1.SuspendLayout();
            this.panel2.SuspendLayout();
            this.panel3.SuspendLayout();
            this.groupBox1.SuspendLayout();
            ((System.ComponentModel.ISupportInitialize)(this.dgvAccount)).BeginInit();
            this.SuspendLayout();
            // 
            // panel1
            // 
            this.panel1.Controls.Add(this.dgvAccount);
            this.panel1.Location = new System.Drawing.Point(12, 12);
            this.panel1.Name = "panel1";
            this.panel1.Size = new System.Drawing.Size(418, 321);
            this.panel1.TabIndex = 0;
            // 
            // panel2
            // 
            this.panel2.Controls.Add(this.btnClose);
            this.panel2.Controls.Add(this.btnDelete);
            this.panel2.Controls.Add(this.btnSave);
            this.panel2.Controls.Add(this.btnSkip);
            this.panel2.Controls.Add(this.btnEdit);
            this.panel2.Controls.Add(this.btnAdd);
            this.panel2.Location = new System.Drawing.Point(436, 256);
            this.panel2.Name = "panel2";
            this.panel2.Size = new System.Drawing.Size(263, 77);
            this.panel2.TabIndex = 1;
            // 
            // panel3
            // 
            this.panel3.Controls.Add(this.groupBox1);
            this.panel3.Location = new System.Drawing.Point(436, 12);
            this.panel3.Name = "panel3";
            this.panel3.Size = new System.Drawing.Size(263, 238);
            this.panel3.TabIndex = 2;
            // 
            // groupBox1
            // 
            this.groupBox1.Controls.Add(this.txbPassword);
            this.groupBox1.Controls.Add(this.txbDisplayName);
            this.groupBox1.Controls.Add(this.txbUserName);
            this.groupBox1.Controls.Add(this.label3);
            this.groupBox1.Controls.Add(this.label2);
            this.groupBox1.Controls.Add(this.label1);
            this.groupBox1.Location = new System.Drawing.Point(3, 3);
            this.groupBox1.Name = "groupBox1";
            this.groupBox1.Size = new System.Drawing.Size(257, 232);
            this.groupBox1.TabIndex = 0;
            this.groupBox1.TabStop = false;
            this.groupBox1.Text = "Thông tin tài khoản";
            // 
            // dgvAccount
            // 
            this.dgvAccount.ColumnHeadersHeightSizeMode = System.Windows.Forms.DataGridViewColumnHeadersHeightSizeMode.AutoSize;
            this.dgvAccount.Dock = System.Windows.Forms.DockStyle.Fill;
            this.dgvAccount.Location = new System.Drawing.Point(0, 0);
            this.dgvAccount.Name = "dgvAccount";
            this.dgvAccount.Size = new System.Drawing.Size(418, 321);
            this.dgvAccount.TabIndex = 0;
            this.dgvAccount.Tag = "-";
            // 
            // label1
            // 
            this.label1.AutoSize = true;
            this.label1.Location = new System.Drawing.Point(9, 28);
            this.label1.Name = "label1";
            this.label1.Size = new System.Drawing.Size(58, 13);
            this.label1.TabIndex = 0;
            this.label1.Text = "Tài khoản:";
            // 
            // label2
            // 
            this.label2.AutoSize = true;
            this.label2.Location = new System.Drawing.Point(6, 54);
            this.label2.Name = "label2";
            this.label2.Size = new System.Drawing.Size(85, 13);
            this.label2.TabIndex = 1;
            this.label2.Text = "Tên người dùng:";
            // 
            // label3
            // 
            this.label3.AutoSize = true;
            this.label3.Location = new System.Drawing.Point(9, 80);
            this.label3.Name = "label3";
            this.label3.Size = new System.Drawing.Size(55, 13);
            this.label3.TabIndex = 2;
            this.label3.Text = "Mật khẩu:";
            // 
            // txbUserName
            // 
            this.txbUserName.Location = new System.Drawing.Point(108, 25);
            this.txbUserName.Name = "txbUserName";
            this.txbUserName.Size = new System.Drawing.Size(143, 20);
            this.txbUserName.TabIndex = 3;
            this.txbUserName.Tag = "_";
            // 
            // txbDisplayName
            // 
            this.txbDisplayName.Location = new System.Drawing.Point(108, 51);
            this.txbDisplayName.Name = "txbDisplayName";
            this.txbDisplayName.Size = new System.Drawing.Size(143, 20);
            this.txbDisplayName.TabIndex = 4;
            this.txbDisplayName.Tag = "_";
            // 
            // txbPassword
            // 
            this.txbPassword.Location = new System.Drawing.Point(108, 77);
            this.txbPassword.Name = "txbPassword";
            this.txbPassword.Size = new System.Drawing.Size(143, 20);
            this.txbPassword.TabIndex = 5;
            this.txbPassword.Tag = "_";
            // 
            // btnAdd
            // 
            this.btnAdd.Location = new System.Drawing.Point(3, 3);
            this.btnAdd.Name = "btnAdd";
            this.btnAdd.Size = new System.Drawing.Size(75, 23);
            this.btnAdd.TabIndex = 0;
            this.btnAdd.Tag = "-";
            this.btnAdd.Text = "&Thêm";
            this.btnAdd.UseVisualStyleBackColor = true;
            // 
            // btnEdit
            // 
            this.btnEdit.Location = new System.Drawing.Point(84, 3);
            this.btnEdit.Name = "btnEdit";
            this.btnEdit.Size = new System.Drawing.Size(75, 23);
            this.btnEdit.TabIndex = 1;
            this.btnEdit.Tag = "_";
            this.btnEdit.Text = "&Chỉnh";
            this.btnEdit.UseVisualStyleBackColor = true;
            // 
            // btnSkip
            // 
            this.btnSkip.Location = new System.Drawing.Point(165, 3);
            this.btnSkip.Name = "btnSkip";
            this.btnSkip.Size = new System.Drawing.Size(75, 23);
            this.btnSkip.TabIndex = 2;
            this.btnSkip.Tag = "_";
            this.btnSkip.Text = "&Bỏ Qua";
            this.btnSkip.UseVisualStyleBackColor = true;
            // 
            // btnSave
            // 
            this.btnSave.Location = new System.Drawing.Point(3, 32);
            this.btnSave.Name = "btnSave";
            this.btnSave.Size = new System.Drawing.Size(75, 23);
            this.btnSave.TabIndex = 3;
            this.btnSave.Tag = "_";
            this.btnSave.Text = "&Lưu";
            this.btnSave.UseVisualStyleBackColor = true;
            // 
            // btnDelete
            // 
            this.btnDelete.Location = new System.Drawing.Point(84, 32);
            this.btnDelete.Name = "btnDelete";
            this.btnDelete.Size = new System.Drawing.Size(75, 23);
            this.btnDelete.TabIndex = 4;
            this.btnDelete.Tag = "_";
            this.btnDelete.Text = "&Xóa";
            this.btnDelete.UseVisualStyleBackColor = true;
            // 
            // btnClose
            // 
            this.btnClose.Location = new System.Drawing.Point(165, 32);
            this.btnClose.Name = "btnClose";
            this.btnClose.Size = new System.Drawing.Size(75, 23);
            this.btnClose.TabIndex = 5;
            this.btnClose.Tag = "-";
            this.btnClose.Text = "Đó&ng";
            this.btnClose.UseVisualStyleBackColor = true;
            // 
            // Test
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(711, 345);
            this.Controls.Add(this.panel3);
            this.Controls.Add(this.panel2);
            this.Controls.Add(this.panel1);
            this.Name = "Test";
            this.Text = "Test";
            this.Load += new System.EventHandler(this.Test_Load);
            this.panel1.ResumeLayout(false);
            this.panel2.ResumeLayout(false);
            this.panel3.ResumeLayout(false);
            this.groupBox1.ResumeLayout(false);
            this.groupBox1.PerformLayout();
            ((System.ComponentModel.ISupportInitialize)(this.dgvAccount)).EndInit();
            this.ResumeLayout(false);

        }

        #endregion

        private System.Windows.Forms.Panel panel1;
        private System.Windows.Forms.DataGridView dgvAccount;
        private System.Windows.Forms.Panel panel2;
        private System.Windows.Forms.Button btnClose;
        private System.Windows.Forms.Button btnDelete;
        private System.Windows.Forms.Button btnSave;
        private System.Windows.Forms.Button btnSkip;
        private System.Windows.Forms.Button btnEdit;
        private System.Windows.Forms.Button btnAdd;
        private System.Windows.Forms.Panel panel3;
        private System.Windows.Forms.GroupBox groupBox1;
        private System.Windows.Forms.TextBox txbPassword;
        private System.Windows.Forms.TextBox txbDisplayName;
        private System.Windows.Forms.TextBox txbUserName;
        private System.Windows.Forms.Label label3;
        private System.Windows.Forms.Label label2;
        private System.Windows.Forms.Label label1;
    }

Code:

public Test()
        {
            InitializeComponent();
        }
        void enControl(bool en)
        {
            foreach (Control ctr in this.Controls)
            {
                if(ctr is TextBox || ctr is Button)
                {
                    switch (ctr.Tag)
                    {
                        case "-":
                            ctr.Enabled = en;
                            break;
                        case "_":
                            ctr.Enabled = !en;
                            break;
                        default:
                            break;
                    }
                }
            }
        }

        private void Test_Load(object sender, EventArgs e)
        {
            enControl(true);
        }

Với code trên thì nó vẫn không chạy được, mạc dù đã set thuộc tính Tag cho các textbox và button rồi.

Sẳn đây cho hỏi tôi muốn tạo usercontrol bao gồm các button như sau:

• btnAdd: status => edit 
• btnSave: status => view
• btnEdit: status => edit
• btnDelete: status => view
• btnSkip: status => view
• btnExit:

status: [view, edit]

• edit: 
  • enabled = true các button: btnSave, btnSkip
  • enabled = false các button: btnAdd, btnEdit, btnDelete, btnClose
• view: 
  • enabled = false các button: btnSave, btnSkip
  • enabled = true các button: btnAdd, btnEdit, btnDelete, btnClose

Bên cạnh đó có thể mở rộng ra, enable các control khác trên form, xóa text, visible,..

Cái này nếu set theo cách thủ công coi bộ hơi mệt, với lại sài muốn sài chung cách trên cho nhiều form. Mong các ace "đồng đạo" hướng dẫn giúp đỡ (mình chỉ mới chuyển sang c# nên ace có thể hướng dẫn cụ thể dùm), có code kèm chú thích càng tốt, thanks nhiều!

public class MyCustomButton : UserControl
{
    public MyCustomButton(string para)
    {
    }
}

use

MyCustormButton my = new MyCustormButton("K9");