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I have a gridView and i have written it's Edit & Update statement with my own ,but the problem i have i can't convert two of gridview textbox which are assigned to BirthDate(datatype=date)and average(datatype=decimal) , and now when i debugg the solution this message is appeared:

The string was not recognized as a valid DateTime. There is an unknown word starting at index 0.
and somethig the same message for average.

my code i have written is as below:
protected void Grid_Updating(object sender, GridViewUpdateEventArgs e) 
        SqlCommand cmd = DataProvider.GenerateCommand("Update_HowzeEducation_SP", CommandType.StoredProcedure); 
        cmd.Parameters.Add("@FieldName", SqlDbType.NVarChar).Value = ((TextBox)GridView1.Rows[e.RowIndex].Cells[1].Controls[0]).Text; 
        cmd.Parameters.Add("@FinishLevelDate", SqlDbType.Date).Value = Convert.ToDateTime(((TextBox)GridView1.Rows[e.RowIndex].Cells[2].Controls[0]).Text.Trim()); 
        cmd.Parameters.Add("@Average", SqlDbType.Decimal).Value = decimal.parse(((TextBox)GridView1.Rows[e.RowIndex].Cells[3].Controls[0]).Text); 
        cmd.Parameters.Add("@SchoolName", SqlDbType.NVarChar).Value = ((TextBox)GridView1.Rows[e.RowIndex].Cells[4].Controls[0]).Text; 
        cmd.Parameters.Add("@StudyCityDescribtion", SqlDbType.NVarChar).Value = ((TextBox)GridView1.Rows[e.RowIndex].Cells[5].Controls[0]).Text; 
        cmd.Parameters.Add("@ThesisTitle", SqlDbType.NVarChar).Value = ((TextBox)GridView1.Rows[e.RowIndex].Cells[6].Controls[0]).Text; 
        cmd.Parameters.Add("@Describtion", SqlDbType.NVarChar).Value = ((TextBox)GridView1.Rows[e.RowIndex].Cells[7].Controls[0]).Text; 
        cmd.Parameters.Add("@HowzeEducationId", SqlDbType.Int).Value = GlobalVariables.HowzeEducationId; 
Posted 8-Oct-12 22:19pm

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