My button click event fires automatically even if i dont click the button.

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C#

I want to add items in my gridview.When i click submit button it works fine.but whenever i press enter in the textbox it calls a button event btnimgnew_Click automatically which i dont want.Below is my C# code.Any help will be appreciated.

protected void btnimgnew_Click(object sender, ImageClickEventArgs e)
    {

        connfordata.Open();
        SqlCommand cmdfrexesp = new SqlCommand("sp_SRXO_InsDocTemplate", connfordata);
        cmdfrexesp.Parameters.AddWithValue("@W113_CompanyID", 5);
        cmdfrexesp.Parameters.AddWithValue("@W113_WebstoreID", 23);
        cmdfrexesp.Parameters.Add("@W113_XMLID", SqlDbType.Int).Direction = ParameterDirection.Output;
        cmdfrexesp.CommandType = CommandType.StoredProcedure;
        cmdfrexesp.ExecuteNonQuery();
        int yourResult = Convert.ToInt32(cmdfrexesp.Parameters["@W113_XMLID"].Value);
        connfordata.Close();
        txtCurrentOrder.Text = yourResult.ToString();
    }

    protected void txtOrderLineNo_TextChanged(object sender, EventArgs e)
    {
        
        Addtogrid(); 
        
    }
public void Addtogrid() 
{
//some code here
}