not delete record in gridview

gridview

 

onpageindexchanging="SentBoxGridView_PageIndexChanging" PageSize="1" OnRowDeleting="SentBoxGridView_RowDeleting">



ValidationGroup='<%# Eval("MessageId") %>' OnClientClick="document.getElementById('form1').target ='_self';">Reply








SortExpression="FromName"/>
SortExpression="MessageBody" />

 

 

 

 

code behind file 

 

protected void SentBoxGridView_RowDeleting(object sender, GridViewDeleteEventArgs e)
{
GridViewRow row = SentBoxGridView.Rows[e.RowIndex];

TextBox MessageId = (TextBox)row.FindControl("MessageId");
SqlConnection con;

con = new SqlConnection(ConfigurationManager.ConnectionStrings["SAVARIConnectionString5"].ConnectionString);
con.Open();
SqlCommand cmd = new SqlCommand("delete from Messages where MessageId='" + MessageId + "'", con);
cmd.ExecuteNonQuery();
con.Close();

}