how to solve this error???

Question

Compiler Error Message: CS1061: 'def2_aspx' does not contain a definition for 'DropDownList2_SelectedIndexChanged' and no extension method 'DropDownList2_SelectedIndexChanged' accepting a first argument of type 'def2_aspx' could be found (are you missing a using directive or an assembly reference?) Source Error: Line 55: Line 56: Line 57: Line 58: Line 59:

Anil Jha · Answer

In your code behind page def2_aspx.cs make sure you check protected void DropDownList2_SelectedIndexChanged(object sender EventArgs e) {} is there. In your code behind page there is no reference for DropDownList2_SelectedIndexChanged method. I think there is some spelling mistake in DropDownList2_SelectedIndexChanged method at code behind page. Check you method if any typo error then your issue will be resolved.