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In my ASP.NET project. I have two dropdownlist and a checkbox. When the checkbox is checked, the selected value of DropDownList1 must be same as selcted value of the DropDownList2 . But the DropDownList1.SelectedValue is not working. Here is my code: protected void chkSameBAddress_CheckedChanged(object sender, EventArgs e) { try { if (this.chkSameBAddress.Checked == true) { this.txtcSAddress1.Text= this.txtcBAddress1.Text; this.txtcSAddress2.Text = this.txtcBAddress2.Text; this.txtcSAddress3.Text = this.txtcBAddress3.Text; this.txtcSAddress4.Text = this.txtcBAddress4.Text; this.txtcSCity.Text = this.txtcBCity.Text; this.txtcSPostCode.Text = this.txtcBPostCode.Text; this.txtcSState.Text = this.txtcBState.Text; this.ddlcSCountry.Items.FindByValue(ddlcBCountry.SelectedItem.Value).Selected = true; } } catch (Exception ex) { logger.Error(ex.Message); throw; } } As seen in the example above, if chkSmaeBAddress is checked then the selected value of ddlcSCountry must be same as ddlcBCountry selected value.

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