如何在Visual Studio中的部分类中调用cll方法

Question

This is called file.cs in Visual Studio web application with C#. I want to call the function ReadOnlySetting() in file.designer.cs. I tried calling this after the "initialize component" like this ReadOnlySetting(); I am getting the error "must return type"

namespace WindowsFormsApplication7
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            SqlConnection con = new SqlConnection("Data Source=LENOVO-        PC;Integrated Security=True");
            con.Open();
            SqlCommand sc = new SqlCommand("insert intp Emp values('" +     textBox2.Text + "'," + textBox1.Text + ",'" + textBox3.Text + "','" + textBox4.Text + "'," + textBox5.Text + ");", con);
            object o = sc.ExecuteNonQuery();
            MessageBox.Show(o+ " :Record has been inserted");
            con.Close();
        }

        //sender controls what the action is for
        //EventArgs is the argument 
        private void button2_Click(object sender, EventArgs e)
        {
            Application.Exit(); 
        }

        **private void ReadOnlySetting()**
        {
            this.textBox2.ReadOnly = true;
        }

        public static void main(string[] args)
        {
            Application.Run(new Form1());
        }

    }
}

This is my file.designer.cs

namespace WindowsFormsApplication7
{
    partial class Form1
    {
        /// <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.components = new System.ComponentModel.Container();
            this.dataSet1 = new WindowsFormsApplication7.DataSet1();
            this.dataSet1BindingSource = new System.Windows.Forms.BindingSource(this.components);
            this.label1 = new System.Windows.Forms.Label();
            this.textBox2 = new System.Windows.Forms.TextBox();
            this.label2 = new System.Windows.Forms.Label();
            this.textBox3 = new System.Windows.Forms.TextBox();
            this.label3 = new System.Windows.Forms.Label();
            this.textBox1 = new System.Windows.Forms.TextBox();
            this.label4 = new System.Windows.Forms.Label();
            this.textBox4 = new System.Windows.Forms.TextBox();
            this.textBox5 = new System.Windows.Forms.TextBox();
            this.label5 = new System.Windows.Forms.Label();
            this.button1 = new System.Windows.Forms.Button();
            this.button2 = new System.Windows.Forms.Button();
            ((System.ComponentModel.ISupportInitialize)(this.dataSet1)).BeginInit();
            ((System.ComponentModel.ISupportInitialize)(this.dataSet1BindingSource)).BeginInit();
            this.SuspendLayout();
            this.textBox2.ReadOnly = true;
            // 
            // dataSet1
            // 
            this.dataSet1.DataSetName = "DataSet1";
            this.dataSet1.SchemaSerializationMode = System.Data.SchemaSerializationMode.IncludeSchema;
            // 
            // dataSet1BindingSource
            // 
            this.dataSet1BindingSource.DataSource = this.dataSet1;
            this.dataSet1BindingSource.Position = 0;
            // 
            // label1
            // 
            this.label1.AutoSize = true;
            this.label1.Location = new System.Drawing.Point(45, 75);
            this.label1.Name = "label1";
            this.label1.Size = new System.Drawing.Size(35, 13);
            this.label1.TabIndex = 3;
            this.label1.Text = "Name";
            // 
            // textBox2
            // 
            this.textBox2.Location = new System.Drawing.Point(86, 72);
            this.textBox2.Name = "textBox2";
            this.textBox2.Size = new System.Drawing.Size(100, 20);
            this.textBox2.TabIndex = 4;
            // 
            // label2
            // 
            this.label2.AutoSize = true;
            this.label2.Location = new System.Drawing.Point(45, 156);
            this.label2.Name = "label2";
            this.label2.Size = new System.Drawing.Size(25, 13);
            this.label2.TabIndex = 3;
            this.label2.Text = "Sex";
            // 
            // textBox3
            // 
            this.textBox3.Location = new System.Drawing.Point(86, 153);
            this.textBox3.Name = "textBox3";
            this.textBox3.Size = new System.Drawing.Size(100, 20);
            this.textBox3.TabIndex = 4;
            // 
            // label3
            // 
            this.label3.AutoSize = true;
            this.label3.Location = new System.Drawing.Point(45, 112);
            this.label3.Name = "label3";
            this.label3.Size = new System.Drawing.Size(26, 13);
            this.label3.TabIndex = 3;
            this.label3.Text = "Age";
            // 
            // textBox1
            // 
            this.textBox1.Location = new System.Drawing.Point(86, 109);
            this.textBox1.Name = "textBox1";
            this.textBox1.Size = new System.Drawing.Size(100, 20);
            this.textBox1.TabIndex = 4;
            // 
            // label4
            // 
            this.label4.AutoSize = true;
            this.label4.Location = new System.Drawing.Point(45, 195);
            this.label4.Name = "label4";
            this.label4.Size = new System.Drawing.Size(45, 13);
            this.label4.TabIndex = 3;
            this.label4.Text = "Address";
            // 
            // textBox4
            // 
            this.textBox4.Location = new System.Drawing.Point(86, 192);
            this.textBox4.Name = "textBox4";
            this.textBox4.ReadOnly = true;
            this.textBox4.Size = new System.Drawing.Size(100, 20);
            this.textBox4.TabIndex = 4;
            // 
            // textBox5
            // 
            this.textBox5.Location = new System.Drawing.Point(86, 228);
            this.textBox5.Name = "textBox5";
            this.textBox5.Size = new System.Drawing.Size(100, 20);
            this.textBox5.TabIndex = 6;
            // 
            // label5
            // 
            this.label5.AutoSize = true;
            this.label5.Location = new System.Drawing.Point(45, 231);
            this.label5.Name = "label5";
            this.label5.Size = new System.Drawing.Size(58, 13);
            this.label5.TabIndex = 5;
            this.label5.Text = "Phone No.";
            // 
            // button1
            // 
            this.button1.Location = new System.Drawing.Point(163, 278);
            this.button1.Name = "button1";
            this.button1.Size = new System.Drawing.Size(75, 23);
            this.button1.TabIndex = 7;
            this.button1.Text = "Close";
            this.button1.UseVisualStyleBackColor = true;
            this.button1.Click += new System.EventHandler(this.button1_Click);
            // 
            // button2
            // 
            this.button2.Location = new System.Drawing.Point(35, 278);
            this.button2.Name = "button2";
            this.button2.Size = new System.Drawing.Size(75, 23);
            this.button2.TabIndex = 8;
            this.button2.Text = "Submit";
            this.button2.UseVisualStyleBackColor = true;
            // 
            // Form1
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(420, 380);
            this.Controls.Add(this.button2);
            this.Controls.Add(this.button1);
            this.Controls.Add(this.textBox5);
            this.Controls.Add(this.label5);
            this.Controls.Add(this.textBox4);
            this.Controls.Add(this.textBox3);
            this.Controls.Add(this.label4);
            this.Controls.Add(this.label2);
            this.Controls.Add(this.textBox1);
            this.Controls.Add(this.label3);
            this.Controls.Add(this.textBox2);
            this.Controls.Add(this.label1);
            this.Name = "Form1";
            this.Text = "Form1";
            ((System.ComponentModel.ISupportInitialize)(this.dataSet1)).EndInit();
            ((System.ComponentModel.ISupportInitialize)(this.dataSet1BindingSource)).EndInit();
            this.ResumeLayout(false);
            this.PerformLayout();

        }



        #endregion

        private System.Windows.Forms.BindingSource dataSet1BindingSource;
        private DataSet1 dataSet1;
        private System.Windows.Forms.Label label1;
        private System.Windows.Forms.TextBox textBox2;
        private System.Windows.Forms.Label label2;
        private System.Windows.Forms.TextBox textBox3;
        private System.Windows.Forms.Label label3;
        private System.Windows.Forms.TextBox textBox1;
        private System.Windows.Forms.Label label4;
        private System.Windows.Forms.TextBox textBox4;
        private System.Windows.Forms.TextBox textBox5;
        private System.Windows.Forms.Label label5;
        private System.Windows.Forms.Button button1;
        private System.Windows.Forms.Button button2;
    }
}

I don't where I can include my method or how to call it.

Answer 1

Don't put it in the designer. It will just be erased whenever you make a change to your form's design. Call it straight after InitializeComponent.

    public Form1()
    {
        InitializeComponent();
        ReadOnlySetting();
    }