if(!IsPostBack){
//code here
}
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if(!IsPostBack){
//code here
}
TextBox1.Text = reader.IsDBNull(1) == true ? “” : reader.GetDecimal(1).ToString();
NULLIF(‘expression1′,’expression2’)
*if expression1 = expression2 return null
string.IsNullOrEmpty(variable);
GridView1.DataSource = null;
GridView1.DataBind();
String variable = reader.IsDBNull(11) == true ? “” : reader.GetString(11);