how to insert sum value of two text box into third text box

Question

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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

C#

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();
        }

C#

private void txtGrandTotal_TextChanged(object sender, EventArgs e)

Posted 22-Sep-12 6:41am

Manir55

Updated 22-Sep-12 6:44am

Wes Aday

v2

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Comments

[no name] 22-Sep-12 12:46pm

And? How exactly is this a problem?

Manir55 22-Sep-12 12:51pm

when i make a check on check box 1 it gives a value to textbox1 similarly when i make a check on checkbox2 it gives a value in textbox2 now I want to add both value to third text box automatically. I want to know how to do it? Please help

[no name] 22-Sep-12 14:37pm

I am still not seeing what your problem could possibly be. Create a changed event on the checkbox, get the 2 values you want to add together, add them together and put the sum in the other textbox.

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Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) · Accepted Answer · 2012-09-22T07:43:00

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

C#

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(); 
        }

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

Thanks...