convert blank textbox into int value 0

"i am having a textbox with datatype double"

No I am afraid that you do not. Textbox's contain strings not doubles. As Richard said, there is plenty of errors in your code. But to answer your question:

protected void btnsubmit2_Click(object sender, ImageClickEventArgs e)
{
    double stotal_recpt2;
    if (string.IsNullOrEmpty(txttotal_recpt2.Text)
    {
        stotal_rectp2 = 0;
    }

    // Do something with stotal_recpt2;
    
}

Lets first assume you have a little typo, and that you have a textbox called txtRecpt. I propose the following (and safest, imo) solution:

double stotal_recpt2 = 0;
double.TryParse(txtRecpt.Text, out stotal_recpt2);

//Do what you need to with stotal_recpt2  

Hope this helps,

--Dom

hi dear,

Double can not compare with string like ""

double stotal_recpt2;
if(stotal_recpt2 = "")

if(Convert.ToDouble(stotal_recpt2) = 0;)
{
stotal_recpt2.text = "0";
}

else
{
Convert.ToDouble(txttotal_recpt2.Text.Trim());
}
}

I hope It Will Helpfull to you

Mahesh Patel

<script type="text/javascript">
function Value() {
    var txtbox1 = document.getElementById("txtbox1");
    txtbox1.value = 0;
}
</script>


<form>
<input type="textbox" id="txtbox1">
<input type="button" value="value -->" onclick="Value();">
</form>

protected void btnsubmit2_Click(object sender, ImageClickEventArgs e)
{

double stotal_recpt2;

//(0 + textBox1.Text) is a string block and concatenate 0 with text box value
// If texbox is empty then string block is (0)
// If text box has a value 123.5 then string block is (0123.5)
// At the above (0) and (0123.5) cases and by using the following method,
// stotal_recpt2 is equal to 0 and 123.5
// If text box has value as text or other charactors or unrecognizable pattern
// then it goes 0 by catch block

try
{
stotal_recpt2 = System.Convert.ToDouble(0 + textBox1.Text);
}
catch
{
stotal_recpt2 = 0;
}
}