Problem in Updating code for database

public partial class _Default : System.Web.UI.Page 
{
    SqlConnection cn = new SqlConnection("data source=.; initial catalog= Details; integrated security=sspi");
    SqlDataAdapter adp1, adp2;
    SqlCommandBuilder cmb;
    DataSet ds, ds2;
    byte[] hashValue, MessageBytes;
    string StringtoConvert;
    UnicodeEncoding MyUniCodeEncoding;

    protected void Page_Load(object sender, EventArgs e)
    {
        adp1 = new SqlDataAdapter("select * from client", cn);
        ds = new DataSet();
        adp1.Fill(ds, "emp");
        cmb = new SqlCommandBuilder(adp1);
    }

    protected void Button1_Click(object sender, EventArgs e)
    {
        //TextBox8.Text = "";
        TextBox9.Text = "";
       // StringtoConvert = TextBox2.Text;
        StringtoConvert = TextBox3.Text;
        MyUniCodeEncoding = new UnicodeEncoding();
        MessageBytes = MyUniCodeEncoding.GetBytes(StringtoConvert);
        SHA1Managed SHhash = new SHA1Managed();
        hashValue = SHhash.ComputeHash(MessageBytes);
        foreach (byte b in hashValue)
        {
           // TextBox8.Text = TextBox8.Text + string.Format("{0:X1}", b);
            TextBox9.Text = TextBox9.Text + string.Format("{0:X9}", b);
        }

        adp2 = new SqlDataAdapter("select * from client where UserName='" + TextBox2.Text + "'", cn);
        ds2 = new DataSet();
        adp2.Fill(ds2, "emp");

        if (ds2.Tables["emp"].Rows.Count > 0)
        {
            Response.Write("Username already exists, Try another username");
        }
        else
        {
            DataRow rw = ds.Tables[0].NewRow();
            rw[0] = TextBox1.Text;
            rw[1] = TextBox2.Text;
            rw[2] = TextBox9.Text;
            rw[3] = DropDownList1.Text;
            rw[4] = TextBox6.Text;
            rw[5] = TextBox7.Text;
            ds.Tables[0].Rows.Add(rw);
            //adp1.Update(ds.Tables[0]);
            adp1.Update(ds.Tables[0]);
            Response.Write("Data is added");
            GridView1.DataSource = ds.Tables[0];
            GridView1.DataBind();

            HyperLink1.Visible = true;
        }
    
    }

Line 82:
Line 83:             adp1.Update(ds.Tables[0]);
Line 84:             Response.Write("Data is added");
Line 85:

Source File: e:\Amul Websites\AMUL WEBSITES\ LOGIN PAGE\SignUP.aspx.cs    Line: 83

Stack Trace:


[SqlException (0x80131904): String or binary data would be truncated.
The statement has been terminated.]

   System.Data.Common.DbDataAdapter.UpdatedRowStatusErrors(RowUpdatedEventArgs rowUpdatedEvent, BatchCommandInfo[] batchCommands, Int32 commandCount) +1472823
   System.Data.Common.DbDataAdapter.UpdatedRowStatus(RowUpdatedEventArgs rowUpdatedEvent, BatchCommandInfo[] batchCommands, Int32 commandCount) +45
   System.Data.Common.DbDataAdapter.Update(DataRow[] dataRows, DataTableMapping tableMapping) +2257
   System.Data.Common.DbDataAdapter.UpdateFromDataTable(DataTable dataTable, D