ASP.NET,Gettting Error in the Program

Hi,

please have look into the code and let me know the solution plz.

string

ProID;try

{

using(SqlConnection conn=new SqlConnection(source))

{

conn.Open();

DataSet ds=

new DataSet();

DDLProject.Items.Clear();

SqlCommand cmd=

new SqlCommand("SP_ProjectSelect",conn);

cmd.CommandType=CommandType.StoredProcedure;

cmd.Parameters.Add("Name",SqlDbType.NChar,30,"@.Name");

cmd.UpdatedRowSource=UpdateRowSource.None;

cmd.Parameters["Name"].Value=DDLProductLine.SelectedItem;

SqlDataReader dr=cmd.ExecuteReader(); ---->>>> Here iam getting Following Error.

while(dr.Read())

{ Response.Write(dr["ID"].ToString());

}

}

}

catch(System.Exception ex)

{

Response.Write(ex);

}

Error:

System.InvalidCastException: Object must implement IConvertible. at System.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream) at System.Data.SqlClient.SqlCommand.ExecuteReader() at MIS.UI.ResourceList.DDLProductLine_SelectedIndexChanged(Object sender, EventArgs e) in c:\inetpub\wwwroot\dotnet pgms\mis\ui\resourcelist.aspx.cs:line 121

Any suggestion plzz,where went wrong.

Thanks in advance

Regards

Mahesh Reddy

Is it possible your stored procedure "SP_ProjectSelect" is not returning a result set? That's what it sounds like.|||

I think your oder in parameter.add was not correct.

The order should be SQL parameter, DataType, and Input Value.

In your case, it looks like

cmd.Parameters.Add("@.Name",SqlDbType.NChar,30,Name);

Here, "@.Name" is SQL parameter name, Name is the valueable you want to input. You can use "Name" for test. In this case, you will insert "Name" into table.

Also, NChar is not the good datatype for string name. I suggest you change it to VarChar (You need change it in SQL SP too).

Hope it helps