Problem to change the value in combobox

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C#

ASP.NET

Hai,

In my project I am using combobox which is Get the Values from database
DataTextField- Name
DataValueField-Code

When I select the combobox the values is correctly saved.
And then I retrieve the values from database like following

cmbprice.SelectedValue = dt.Rows[0]["LM_PRISELIST"].ToString();

This is Getting the Correct values, But it is not assigned to the values. It is not changing the combobox selectedvalue. But I check using following coding

string str=dt.Rows[0]["LM_PRISELIST"].ToString();

But when I assigned to the combobox, the value is not changing. I didn't Know What is the Problem?

Please help me