如何将两个文本框的和值插入第三个文本框 [英] how to insert sum value of two text box into third text box

问题描述

我有一个表单中的三个文本框和两个与textbox1和textbox2相关联的复选框.
另一个文本框被命名为grandtotal.当我选中复选框时，它将在两个文本框中插入值.现在，我想将值的总和插入到名为grandtotal
的第三个文本框中
以下是文本框1和文本框1的我的代码

I have three text boxes in a form and two check box associated to textbox1 and textbox2.
Another textbox is named as grandtotal. When I checked on check box it insert value in two text boxes. Now I want to insert sum of value into third text box which is named as grandtotal

Below are the my codes for the text box 1 and text box 1

private void checkBoxAdmission_CheckedChanged(object sender, EventArgs e)
        {
            SQLHelper objsql = new SQLHelper();
            objsql.SqlText = " select SettingID,SettingValue from tblSettings where SettingID  = 1";

            objsql.AddParameter("FeetypeID", checkBoxAdmission.Checked);
            DataTable dt = objsql.getDataTable(false);
            if (dt.Rows.Count > 0)

                txtAdmissionFee.Text =dt.Rows[0]["SettingValue"].ToString();

            objsql.Close();
            objsql.Dispose();
        }

        private void checkBoxMonthly_CheckedChanged(object sender, EventArgs e)
        {
            SQLHelper objsql = new SQLHelper();
            objsql.SqlText = " select SettingID,SettingValue from tblSettings where SettingID  = 2";
            
            objsql.AddParameter("FeetypeID", checkBoxMonthly.Checked);
            DataTable dt = objsql.getDataTable(false);
            if (dt.Rows.Count > 0)

                txtMonthlyFee.Text = dt.Rows[0]["SettingValue"].ToString();

            objsql.Close();
            objsql.Dispose();
        }

private void txtGrandTotal_TextChanged(object sender, EventArgs e)

推荐答案

您可以将第二个复选框本身填充到第三个文本框中，如下所示...

You can fill the third textbox with the second checkbox click itself like below...

private void checkBoxMonthly_CheckedChanged(object sender, EventArgs e)
        {
            // Declare grandTotal. Take datatype as per your requirement.
            int grandTotal;
 
            SQLHelper objsql = new SQLHelper();
            objsql.SqlText = " select SettingID,SettingValue from tblSettings where SettingID  = 2";
            
            objsql.AddParameter("FeetypeID", checkBoxMonthly.Checked);
            DataTable dt = objsql.getDataTable(false);
            if (dt.Rows.Count > 0)
 
                txtMonthlyFee.Text = dt.Rows[0]["SettingValue"].ToString();
 
            objsql.Close();
            objsql.Dispose();
            
            // Add values and fill to third textbox.
            grandTotal = Convert.ToInt32(txtAdmissionFee.Text) + Convert.ToInt32(txtMonthlyFee.Text);
            txtGrandTotal.Text = grandTotal.ToString(); 
        }

注意:根据您的要求采用数据类型和转换机制.

谢谢...

NOTE: Take datatype and conversion mechanism as per your requirements.

Thanks...

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