hi this is my ImageButton event code

    protected void ImageButton_Click1(object sender, ImageClickEventArgs e)
    {
        string data = Server.UrlDecode(Request.QueryString["BehCode2"]);

       

  
            SqlCommand _cmd = new SqlCommand("insertinfo", _cn);
            _cmd.CommandType = CommandType.StoredProcedure;
            _cn.Open();

            _cmd.Parameters.AddWithValue("@Name", txtstore.Text);
            _cmd.Parameters.AddWithValue("@Ownername", Txtname.Text);
            _cmd.Parameters.AddWithValue("@Description", CKEditorControl1.Text);
            _cmd.Parameters.AddWithValue("@address", Txtadd.Text);
            _cmd.Parameters.AddWithValue("@City", DDL1.SelectedItem.Text);
            _cmd.Parameters.AddWithValue("@Region", DDL2.SelectedItem.Text);
            _cmd.Parameters.AddWithValue("@ShoppingCenter", DDL3.SelectedItem.Text);
            _cmd.Parameters.AddWithValue("@tell", txttell.Text);
            _cmd.Parameters.AddWithValue("@tell1", Txttell2.Text);
            _cmd.Parameters.AddWithValue("@code", txtcode.Text);
            _cmd.Parameters.AddWithValue("@fax", Txtfax.Text);
            _cmd.Parameters.AddWithValue("@Mobile", Txtmob.Text);
            _cmd.Parameters.AddWithValue("@Email", Txtemail.Text);
            _cmd.Parameters.AddWithValue("@Web", Txtweb.Text);
            _cmd.Parameters.AddWithValue("@Service1", TxtMT1.Text);
            _cmd.Parameters.AddWithValue("@Service2", TxtMT2.Text);
            _cmd.Parameters.AddWithValue("@Service3", TxtMT3.Text);
            _cmd.Parameters.AddWithValue("@Service4", TxtMT4.Text);
            _cmd.Parameters.AddWithValue("@Service5", TxtMT5.Text);
            _cmd.Parameters.AddWithValue("@Service6", TxtMT6.Text);
            _cmd.Parameters.AddWithValue("@Service7", TxtMT7.Text);
            _cmd.Parameters.AddWithValue("@Service8", TxtMT8.Text);


            _cmd.Parameters.AddWithValue("@behcode", data);
          
            _cmd.ExecuteNonQuery();

            _cn.Close();
       

       
      
        Response.Redirect(Request.Url.AbsoluteUri);
    }




    }

when i click on button to insert data in database this error occur

Server Error in '/behtop website' Application.

String or binary data would be truncated. The statement has been terminated.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.  Exception Details: System.Data.SqlClient.SqlException: String or binary data would be truncated. The statement has been terminated. Source Error: 

Line 794:            _cmd.Parameters.AddWithValue("@behcode", data);
Line 795:          
Line 796: _cmd.ExecuteNonQuery(); Line 797:
Line 798:            _cn.Close();

SP

LTER procedure [dbo].[insertinfo]


@Name nvarchar(30),@Ownername nvarchar(30),@Behcode nvarchar(10)
,@City nvarchar(30),@Region  varchar(10),@address nvarchar(max),@ShoppingCenter nvarchar(50)
,@tell varchar(15),@tell1 varchar(15),@code varchar(15),@Fax varchar(10),@Mobile varchar(15),
@Email varchar(MAX),@Web varchar(MAX),@Description nvarchar(MAX),@Service1  nvarchar(20),
@Service2  nvarchar(20),@Service3  nvarchar(20),@Service4  nvarchar(20),@Service5  nvarchar(20)
,@Service6  nvarchar(20),@Service7  nvarchar(20),@Service8  nvarchar(20)
as
begin




update House_info set Name=@Name,Date=GETDATE(),Ownername=@Ownername,BehCode=@Behcode
,City=@City,Region=@Region,address=@address,ShoppingCenter=@ShoppingCenter,Tell=@tell,Tell1=@tell1
,Code=@code,fax=@Fax,email=@Email,web=@Web,Description=@Description,Service1=@Service1,Service2=@Service2,Service3=@Service3
,Service4=@Service4,Service5=@Service5,Service6=@Service6,Service7=@Service7,Service8=@Service8
where BehCode=@Behcode 

end

best regards