how to set the default value to the drop down list control

Question

I have a drop down list control on my web page  I have bind the datatable to the dropdownlist control as follows -  lstDepartment DataTextField    DepartmentName       lstDepartment DataValueField    DepartmentID       lstDepartment DataSource   dtDept      lstDepartment DataBind      in the page load event i want to set the default value to the drop down list control from my other table field   how to do this

User · Answer

if you know the index of the item of default value,just

lstDepartment.SelectedIndex = 1;//the second item

or if you know the value you want to set, just

lstDepartment.SelectedValue = "the value you want to set";

User · Answer

Assuming that the DropDownList control in the other table also contains DepartmentName and DepartmentID   lstDepartment ClearSelection     foreach  var item in lstDepartment Items       if  item Value    otherDropDownList SelectedValue          item Selected   true

User · Answer

lstDepartment DataTextField    DepartmentName   lstDepartment DataValueField    DepartmentID   lstDepartment DataSource   dtDept  lstDepartment DataBind     Set the initial value  lstDepartment SelectedValue   depID  lstDepartment Attributes Remove  InitialValue    lstDepartment Attributes Add  InitialValue   depID     And in your cancel method   lstDepartment SelectedValue   lstDepartment Attributes  InitialValue      And in your update method   lstDepartment Attributes  InitialValue     lstDepartment SelectedValue

User · Answer

After your DataBind     lstDepartment SelectedIndex   0     first item  or  lstDepartment SelectedValue    Yourvalue   or    add error checking  just an example  FindByValue may return null lstDepartment Items FindByValue  Yourvalue   Selected   true   or   add error checking  just an example  FindByText may return null lstDepartment Items FindByText  Yourvalue   Selected   true

[c#] how to set the default value to the drop down list control?

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